CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

How to store transient data with various timestep?

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   December 16, 2005, 00:33
Default How to store transient data with various timestep?
  #1
Oliver
Guest
 
Posts: n/a
Hi,

I've a problem storing transient data. I run the transient simulation from 0 to 10 second with time step of 0.00001 second but I only want to save data as follows:

1) from 0 to 1 second with 0.0001second time intervals

2) from 1 to 2 second with 0.001second time intervals

3) from 2 to 3 second with 0.1 second time intervals

4) from 3 to 10 second with 1 second time intervals

How can I specify time intervals in Pre (under Output Control menu)? I've both 5.7.1 and 10 at different machines.

In 5.7.1, I can either select a fixed time intervals or put a time list....However, I have different time intervals here. Inserting 1000+++ time value in the time list is exhuasting....Any better way of doing this? If it's not possible, please also let me know....

Thanks for your help. Oliver.
  Reply With Quote

Old   December 16, 2005, 08:24
Default Re: How to store transient data with various times
  #2
Rui
Guest
 
Posts: n/a
Hi,

As far as I know it isn't possible. The only way I see to do that is by creating 4 different simulations, and starting simulation 2 with the .res file from simulation 1, and so on.

Regards,

Rui
  Reply With Quote

Old   December 16, 2005, 18:01
Default Re: How to store transient data with various times
  #3
Jianping
Guest
 
Posts: n/a
Hi, Oliver

If you input 10000*0.0001, 1000*0.001, 10*0.1, 7*1 as your time step, you should be able to get what you want.

Regards!

Jianping
  Reply With Quote

Old   December 18, 2005, 20:29
Default Re: How to store transient data with various times
  #4
Oliver
Guest
 
Posts: n/a
"If you input 10000*0.0001, 1000*0.001, 10*0.1, 7*1 as your time step, you should be able to get what you want."

Thanks for your help but how could the solver know the time when the time step start to change if you specify this way?

e.g. 1000*0.001 time interval is supposed to start at t=1 second while 7*1 time interval will start at t=3second....
  Reply With Quote

Old   December 18, 2005, 20:56
Default Re: How to store transient data with various times
  #5
Jianping
Guest
 
Posts: n/a
Hi,

If you feel confused about this, you can simply test it by run a case with time step as '2*0.1, 2*1'.

Regards!

Jianping
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to extract data from a completed transient run Vince CFX 2 July 15, 2008 05:05
No data for timestep solutions bouke OpenFOAM Paraview & paraFoam 8 June 12, 2007 10:06
How to update polyPatchbs localPoints liu OpenFOAM Running, Solving & CFD 6 December 30, 2005 18:27
Loading transient data of moving grid leo CD-adapco 3 April 9, 2003 01:35
Writing a transient data fileld ant CFX 0 October 20, 2002 12:19


All times are GMT -4. The time now is 22:33.